The uprising happened in 1944 just before the German occupation ended, not before

As I understand it, the idea was that the Alliance, led by the Soviets would help the Home Army drive the Germans out of Poland and it would be over in a few days. Instead, Stalin stalled his men, the Home Army was left on its own, outnumbered by the Germans, and the uprising lasted for two months instead of a few days.

But thanks for your comment, and glad you enjoyed the walk.